Axial flow fan with noise reduction function

Abstract

The utility model relates to the technical field of grain storage, and discloses an axial flow fan with a noise reduction function, which comprises an axial flow fan body and two noise reduction devices, the two ends of the axial flow fan body are respectively an air inlet end and an air outlet end, the two noise reduction devices are respectively arranged at the air inlet end and the air outlet end of the axial flow fan body, and the noise reduction devices are respectively arranged at the air inlet end and the air outlet end of the axial flow fan body. The noise reduction device comprises a noise reduction outer cylinder, an inner cylinder fixed in the noise reduction outer cylinder, and a sound absorption material filled in the inner wall of the noise reduction outer cylinder and the outer wall of the inner cylinder. The axial flow fan has the advantages that the noise reduction devices are installed at the air inlet end and the air outlet end of the axial flow fan body, pneumatic noise at the air inlet end and the air outlet end can be effectively reduced, and physical and psychological health of workers is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of grain storage, in particular to an axial flow fan with a noise reduction function. Background Art

[0002] During grain storage, ventilation equipment is required for ventilation. Axial flow fans are common ventilation equipment. While they provide ventilation, they also cause a certain degree of noise pollution. As the level of attention paid to occupational hazards during grain storage operations increases, the demand for noise control becomes stronger. Among the noises generated by axial flow fans during operation, mechanical noise accounts for a small proportion, and the main noise is pneumatic noise, especially the pneumatic noise at the air inlet and outlet ends. Therefore, it is necessary to reduce the noise at the air inlet and outlet ends of the axial flow fan. Utility Model Content

[0003] The utility model aims to provide an axial flow fan with a noise reduction function, which has the effect of reducing the noise of the air inlet end and the air outlet end of the axial flow fan.

[0004] The above technical purpose of the utility model is achieved through the following technical solutions: an axial flow fan with noise reduction function, comprising an axial flow fan body and two noise reduction devices, the two ends of the axial flow fan body are respectively an air inlet end and an air outlet end, the two noise reduction devices are respectively installed at the air inlet end and the air outlet end of the axial flow fan body, the noise reduction device comprises a noise reduction outer cylinder, an inner cylinder fixed in the noise reduction outer cylinder, and a sound-absorbing material filled between the inner wall of the noise reduction outer cylinder and the outer wall of the inner cylinder, the side wall of the inner cylinder is provided with a plurality of through holes, the inner wall of the noise reduction outer cylinder is provided with a plurality of channels, a cleaning pipe is provided in the channel, and the side wall of the cleaning pipe is provided with a spray hole.

[0005] By adopting the above technical scheme, the utility model arranges noise reduction devices at the air inlet end and the air outlet end of the axial flow fan body, and fills the noise reduction outer cylinder and the inner cylinder in the noise reduction device with sound-absorbing material, which can absorb aerodynamic noise, effectively reduce the noise during the operation of the axial flow fan, and protect the physical and mental health of the staff.

[0006] After the axial flow fan body has been running for a period of time, a large amount of dust adheres to the sound-absorbing material in the noise reduction device, and the noise reduction device needs to be cleaned regularly. Since the sound-absorbing material is filled between the outer cylinder and the inner cylinder of the noise reduction device, it is very troublesome and inefficient to disassemble it for cleaning and drying.

[0007] When it is necessary to clean the noise reduction device, first remove the noise reduction device from the axial flow fan body, connect it to the cleaning pipe with a hose, use a pump to pump the cleaning agent along the hose into the cleaning pipe, and then the cleaning agent is sprayed out along the spray hole, flows through the absorbing material and flows out from the perforation of the inner cylinder. The staff then sprays the inner wall of the inner cylinder. Without removing the inner cylinder, outer cylinder and sound-absorbing material, the inside and outside of the sound-absorbing material are effectively cleaned, which is convenient for the staff to clean.

[0008] The utility model is further configured as follows: a plurality of fixed pipe sections are fixed to the inner wall of the noise reduction outer cylinder, a slot is opened on the side wall of the fixed pipe section, the internal space of the fixed pipe section is the channel, the cleaning pipe is embedded in the fixed pipe section and can slide in the fixed pipe section, and the spray hole faces the slot.

[0009] By adopting the above technical solution, the cleaning pipe can move in the fixed pipe section to achieve flushing of the sound-absorbing material at different positions.

[0010] The utility model is further configured as follows: the cross section of the cleaning pipe is rectangular, and the cross section of the fixed pipe section is rectangular.

[0011] By adopting the above technical solution, the cleaning pipe is prevented from rotating relative to the fixed pipe section, so that the spray hole on the cleaning pipe can always face the slot of the fixed pipe section, and the cleaning agent sprayed from the spray hole can flush the sound absorbing material through the slot.

[0012] The utility model is further configured as follows: the fixed pipe section and the cleaning pipe are both arranged axially along the noise reduction outer cylinder, a plurality of the fixed pipe sections are evenly distributed along the circumferential direction of the noise reduction outer cylinder, and a plurality of the cleaning pipes are evenly distributed along the circumferential direction of the noise reduction outer cylinder.

[0013] The utility model is further configured as follows: end rings are installed at both ends of the noise reduction outer cylinder away from the axial flow fan body, the outer edges of the end rings are clamped on the noise reduction outer cylinder, and the inner edges of the end rings are clamped on the inner cylinder.

[0014] By adopting the above technical solution, the end ring can be removed from the noise reduction outer cylinder and the inner cylinder.

[0015] The utility model is further configured as follows: the noise reduction device also includes a cover net and a plurality of connecting bolts. A threaded hole is opened on the end ring, and the cover net is provided with a plurality of mounting holes. The connecting bolts pass through the mounting holes and are threadedly connected in the threaded holes. The cover net covers the end of the inner cylinder away from the axial flow fan body and the end of the noise reduction outer cylinder away from the axial flow fan body.

[0016] By adopting the above technical solution, the cover net is fixed by connecting bolts, so that the cover net covers the ends of the noise reduction outer cylinder and the inner cylinder, thereby preventing external debris from entering the noise reduction device and the axial flow fan body.

[0017] The utility model is further configured as follows: the noise reduction device further comprises a noise reduction tube core, the noise reduction tube core is located in the inner tube, and the noise reduction tube core is fixed to the inner wall of the inner tube through a plurality of connecting supports.

[0018] By adopting the above technical solution, the noise reduction core also plays a role in reducing noise.

[0019] The utility model is further configured as follows: first connecting rings are fixed at both ends of the axial flow fan body, a second connecting ring is fixed at the end of the noise reduction outer cylinder, and the first connecting ring and the second connecting ring are connected by fastening bolts and fastening nuts.

[0020] By adopting the above technical solution, the noise reduction device can be removed from the axial flow fan body by removing the fastening bolts and the fastening nuts.

[0021] The beneficial effects of the utility model are:

[0022] 1. By installing noise reduction devices at the air inlet and outlet ends of the axial flow fan body, the aerodynamic noise at the air inlet and outlet ends can be effectively reduced to protect the physical and mental health of the workers.

[0023] 2. When it is necessary to clean the sound-absorbing material in the noise reduction device, remove the fastening bolts and fastening nuts, remove the noise reduction device from the axial flow fan body, loosen the connecting bolts, remove the cover net, connect the hose with the pump to the cleaning pipe, and the pump pumps the cleaning agent into the cleaning pipe. The cleaning agent is sprayed from the spray hole of the cleaning pipe into the sound-absorbing material and flows out from the perforation of the inner tube. The staff then rinses the inner wall of the inner tube. The inside of the sound-absorbing material can be effectively cleaned without disassembling the sound-absorbing material, which greatly facilitates the cleaning operation of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model.

[0025] Figure 2 It is a structural schematic diagram of the noise reduction device of the utility model.

[0026] Figure 3 It is a schematic diagram of the positional relationship among the noise reduction outer cylinder, the inner cylinder and the noise reduction core cylinder of the utility model.

[0027] Figure 4 It is a schematic diagram of the structural relationship between the fixed pipe section and the cleaning pipe of the utility model.

[0028] In the figure, 1. axial flow fan body; 11. first connecting ring; 2. noise reduction device; 21. noise reduction outer cylinder; 22. inner cylinder; 221. perforation; 23. fixed pipe section; 231. notch; 24. cleaning pipe; 241. spray hole; 25. noise reduction cylinder core; 26. cover net; 27. connecting bolt; 28. end ring; 29. ​​second connecting ring; 3. fastening bolt; 4. fastening nut; 5. connecting support. DETAILED DESCRIPTION

[0029] An axial flow fan with noise reduction function comprises an axial flow fan body 1 and two noise reduction devices 2. The two ends of the axial flow fan body 1 are respectively an air inlet end and an air outlet end, and the two noise reduction devices 2 are respectively installed at the air inlet end and the air outlet end. The noise reduction device 2 comprises a noise reduction outer cylinder 21, an inner cylinder 22, and two end rings 28. The first connecting ring 11 is fixed at both ends of the axial flow fan body 1, and the end of the noise reduction outer cylinder 21 is fixed with a second connecting ring 29. The first connecting ring 11 and the second connecting ring 29 are connected and fixed by a plurality of fastening bolts 3 and fastening nuts 4. The inner cylinder 22 is located inside the noise reduction outer cylinder 21, and the two are coaxially arranged. The two end rings 28 are respectively located at the two ends of the noise reduction outer cylinder 21, and the outer edges of the end rings 28 are fixed on the noise reduction outer cylinder 21, and the inner edges of the end rings 28 are fixed on the inner cylinder 22. The space between the noise reduction outer cylinder 21 and the inner cylinder 22 is filled with sound absorbing material.

[0030] The inner wall of the inner cylinder 22 is provided with a plurality of through holes 221 . A noise reduction cylinder core 25 is also provided at the center of the inner cylinder 22 . A plurality of connecting supports 5 are fixed to the side walls of the noise reduction cylinder core 25 . The connecting supports 5 are fixed to the inner wall of the inner cylinder 22 .

[0031] A plurality of fixed pipe segments 23 are fixed to the inner wall of the noise reduction outer tube 21. The length direction of the fixed pipe segments 23 is arranged along the axial direction of the noise reduction outer tube 21. The plurality of fixed pipe segments 23 are evenly distributed along the circumferential direction of the noise reduction outer tube 21. The cross section of the fixed pipe segment 23 is rectangular, and the internal space is a channel. A cleaning pipe 24 is inserted into the channel. The cross section of the cleaning pipe 24 is also rectangular. The cleaning pipe 24 can slide in the fixed pipe segment 23, but cannot rotate relative to the fixed pipe segment 23. A notch 231 is provided on the side wall of the fixed pipe segment 23. The length direction of the notch 231 is arranged along the length direction of the fixed pipe segment 23. A spray hole 241 is provided on the side wall of the cleaning pipe 24, and the spray hole 241 always faces the notch 231.

[0032] The noise reduction device 2 also includes a cover net 26 and a plurality of connecting bolts 27. A threaded hole is opened on the end ring 28. The cover net 26 has a plurality of mounting holes. The connecting bolts 27 pass through the mounting holes and are threadedly connected in the threaded holes. The cover net 26 covers the ends of the inner tube 22 and the ends of the noise reduction outer tube 21.

[0033] Working principle: By installing the noise reduction device 2 at the air inlet and air outlet of the axial flow fan body 1, the pneumatic noise at the air inlet and air outlet can be effectively reduced. When the sound-absorbing material in the noise reduction device 2 needs to be cleaned, remove the fastening bolts 3 and the fastening nuts 4, remove the noise reduction device 2 from the axial flow fan body 1, remove the end ring 28, loosen the connecting bolts 27, remove the cover net 26, and connect the hose with the pump to the cleaning pipe 24. The pump pumps the cleaning agent into the cleaning pipe 24, and the cleaning agent is sprayed from the spray hole 241 of the cleaning pipe 24 into the sound-absorbing material and flows out from the perforation 221 of the inner tube 22. The staff then rinses the inner wall of the inner tube 22. The inside of the sound-absorbing material can be effectively cleaned without disassembling the sound-absorbing material, which greatly facilitates the cleaning operation of the staff.

Claims

1. An axial flow fan with noise reduction function, characterized in that: The invention comprises an axial flow fan body (1) and two noise reduction devices (2), wherein the two ends of the axial flow fan body (1) are respectively an air inlet end and an air outlet end, and the two noise reduction devices (2) are respectively installed at the air inlet end and the air outlet end of the axial flow fan body (1). The noise reduction device (2) comprises a noise reduction outer cylinder (21), an inner cylinder (22) fixed inside the noise reduction outer cylinder (21), and a sound absorbing material filled between the inner wall of the noise reduction outer cylinder (21) and the outer wall of the inner cylinder (22), a plurality of through holes (221) are opened on the side wall of the inner cylinder (22), a plurality of channels are arranged on the inner wall of the noise reduction outer cylinder (21), a cleaning pipe (24) is arranged in the channel, and a spray hole (241) is arranged on the side wall of the cleaning pipe (24).

2. The axial flow fan with noise reduction function according to claim 1, characterized in that: A plurality of fixed pipe sections (23) are fixed on the inner wall of the noise reduction outer cylinder (21); a slot (231) is provided on the side wall of the fixed pipe section (23); the internal space of the fixed pipe section (23) is the channel; the cleaning pipe (24) is embedded in the fixed pipe section (23) and can slide in the fixed pipe section (23); and the spray hole (241) faces the slot (231).

3. The axial flow fan with noise reduction function according to claim 2, characterized in that: The cleaning pipe (24) has a rectangular cross section, and the fixed pipe section (23) has a rectangular cross section.

4. The axial flow fan with noise reduction function according to claim 2, characterized in that: The fixed pipe section (23) and the cleaning pipe (24) are both arranged along the axial direction of the noise reduction outer cylinder (21), and a plurality of the fixed pipe sections (23) are evenly distributed along the circumferential direction of the noise reduction outer cylinder (21).

5. The axial flow fan with noise reduction function according to claim 1, characterized in that: The noise reduction device (2) further comprises a noise reduction core (25), wherein the noise reduction core (25) is located in the inner tube (22), and the noise reduction core (25) is fixed to the inner wall of the inner tube (22) via a plurality of connecting supports (5).

6. The axial flow fan with noise reduction function according to claim 5, characterized in that: End rings (28) are installed at both ends of the noise reduction outer cylinder (21) away from the axial flow fan body (1); the outer edges of the end rings (28) are clamped on the noise reduction outer cylinder (21), and the inner edges of the end rings (28) are clamped on the inner cylinder (22).

7. The axial flow fan with noise reduction function according to claim 6, characterized in that: The noise reduction device (2) further comprises a cover net (26) and a plurality of connecting bolts (27). The end ring (28) is provided with a threaded hole. The cover net (26) is provided with a plurality of mounting holes. The connecting bolts (27) pass through the mounting holes and are threadedly connected in the threaded holes. The cover net (26) covers the end of the inner cylinder (22) away from the axial flow fan body (1) and the end of the noise reduction outer cylinder (21) away from the axial flow fan body (1).

8. The axial flow fan with noise reduction function according to claim 1, characterized in that: A first connecting ring (11) is fixed to both ends of the axial fan body (1), a second connecting ring (29) is fixed to the end of the noise reduction outer cylinder (21), and the first connecting ring (11) and the second connecting ring (29) are connected via a fastening bolt (3) and a fastening nut (4).

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